Update duckdb index files

.gitattributes

@@ -122,3 +122,4 @@ default/ethereum.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -t
 default/dba.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/emacs.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/codereview.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/robotics.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/robotics.stackexchange.com/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6727fe37247beed38db100c93b6aa0c7cee7fb4535e56f6f437f29d50fa65a1a
+size 2895872